Maximizing Render Field of View in Interior Scene
You can change the sensor size in the camera settings. Or you can change the focal length. But what about distortion for a wide lens - it's physics, you cannot cheat it. If you want, you can use orthographic, or panoramic camera (the latter seems to work in cycles only). If you want an impossible camera shot, you also can make some of your walls to be transparent for camera rays from outside, and make the shot through the wall with the lens focal length you want.